Reviewed and updated: 17 October 2026. Original archive publication date retained.
A licence to alter is a formal way of recording permission for changes to a leasehold property. Whether consent is needed, who gives it and what conditions may apply depend on the lease and the proposed work. This overview concerns England and Wales.
Start with the lease
The Leasehold Advisory Service explains that where a lease requires written consent for an alteration, it should be obtained before work starts. If the wording is unclear or silent, professional advice may be needed.
Do not assume permission for a neighbour’s project covers yours. A proposal involving structure, services or common parts may raise different issues from a decorative change within the flat.
Keep permissions separate
Freeholder or management-company consent does not replace planning permission, listed building consent or building-regulations requirements where those apply. Likewise, a planning approval does not remove obligations in the lease.
Prepare a clear description of the work, drawings and relevant professional information before seeking a decision. Ask what documents, inspections and completion evidence will be required and how any charges are calculated.
Keep the final signed permission with the lease and the project records. A future buyer’s conveyancer may ask for it. Where a proposed change is disputed, obtain advice on the particular lease rather than relying on a general statement that consent must always be granted or can always be refused.